Bring up console (press "~") and type following

open sfhospital

The game will open a map as self described and you should be at Assault spawn point facing west. Bring up console again and type:

playerlock 0

mpcheat ghost

Now turn to a north heading, and "ghost" down to far end of alleyway. At the end is a pickup truck loaded with hospital stuff. LOOK at driver's seat! There he is, the YETI looking pretty happy with himself :)

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